<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>致青春</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      overflow: hidden;
      height: 100vh;
    }

    .fullscreen-image {
      width: 100%;
      height: 100vh;
      object-fit: cover;
    }
  </style>
</head>
<body>
  <img src="img/portal_website.jpg" alt="全屏图片" class="fullscreen-image">
</body>
</html>
